The answer is in the color and veining of these popular Italian marbles.
“Carrara or Calacatta? People often mix up these two marbles, so I decided to create an ideabook to illustrate the differences. These terms are used interchangeably because both of these Italian marbles are very similar in appearance: white with gray veining. To add to the confusion, much of Calacatta comes from Carrara, Italy. In general, Carrara tends to be grayer with softer veining, while Calacatta is whiter with bolder more dramatic veining. There are additional subtle differences and once you know what to look for, you should be able to distinguish between Carrara and Calacatta. Let’s compare some Houzz examples:”